Version: 0.9.77.dev.260505

后端：
1.阶段 6 CP4/CP5 目录收口与共享边界纯化
- 将 backend 根目录收口为 services、client、gateway、cmd、shared 五个一级目录
- 收拢 bootstrap、inits、infra/kafka、infra/outbox、conv、respond、pkg、middleware，移除根目录旧实现与空目录
- 将 utils 下沉到 services/userauth/internal/auth，将 logic 下沉到 services/schedule/core/planning
- 将迁移期 runtime 桥接实现统一收拢到 services/runtime/{conv,dao,eventsvc,model}，删除 shared/legacy 与未再被 import 的旧 service 实现
- 将 gateway/shared/respond 收口为 HTTP/Gin 错误写回适配，shared/respond 仅保留共享错误语义与状态映射
- 将 HTTP IdempotencyMiddleware 与 RateLimitMiddleware 收口到 gateway/middleware
- 将 GormCachePlugin 下沉到 shared/infra/gormcache，将共享 RateLimiter 下沉到 shared/infra/ratelimit，将 agent token budget 下沉到 services/agent/shared
- 删除 InitEino 兼容壳，收缩 cmd/internal/coreinit 仅保留旧组合壳残留域初始化语义
- 更新微服务迁移计划与桌面 checklist，补齐 CP4/CP5 当前切流点、目录终态与验证结果
- 完成 go test ./...、git diff --check 与最终真实 smoke；health、register/login、task/create+get、schedule/today、task-class/list、memory/items、agent chat/meta/timeline/context-stats 全部 200，SSE 合并结果为 CP5_OK 且 [DONE] 只有 1 个

backend/gateway/router/router.go

@@ -7,12 +7,12 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/LoveLosita/smartflow/backend/dao"
 	"github.com/LoveLosita/smartflow/backend/gateway/api"
 	userauthapi "github.com/LoveLosita/smartflow/backend/gateway/api/userauth"
 	gatewaymiddleware "github.com/LoveLosita/smartflow/backend/gateway/middleware"
-	rootmiddleware "github.com/LoveLosita/smartflow/backend/middleware"
-	"github.com/LoveLosita/smartflow/backend/pkg"
+	rootmiddleware "github.com/LoveLosita/smartflow/backend/gateway/middleware"
+	"github.com/LoveLosita/smartflow/backend/services/runtime/dao"
+	ratelimit "github.com/LoveLosita/smartflow/backend/shared/infra/ratelimit"
 	"github.com/LoveLosita/smartflow/backend/shared/ports"
 	"github.com/gin-gonic/gin"
 	"github.com/spf13/viper"
@@ -55,7 +55,7 @@ func StartEngine(ctx context.Context, r *gin.Engine) {
 	}
 }
 
-func RegisterRouters(handlers *api.ApiHandlers, authClient ports.UserAuthClient, cache *dao.CacheDAO, limiter *pkg.RateLimiter) *gin.Engine {
+func RegisterRouters(handlers *api.ApiHandlers, authClient ports.UserAuthClient, cache *dao.CacheDAO, limiter *ratelimit.RateLimiter) *gin.Engine {
 	r := gin.Default()
 	apiGroup := r.Group("/api/v1")
 	{